A system makes sure PPPs, biocontrol agents included, are used only as authorised for the particular crop and purpose (the pest, disease, weed or other target) and as the label or the official registration body's publication recommends. Any off-label use is supported by evidence that the authorities in that country have approved the product for the crop concerned, and every PPP carries a correct label.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.